Looking good, Bernard!!
That's a lot of louvers...but it might help to balance the overall look of the front if the rear is also louvered...
You're right in not wasting time and energy detailing what will never be seen, (except maybe in a picture), after its all buttoned up.
A chopped '37 Ford??? I'll have to visit the TRaK site to see what else you're up to
Later,